Physics Lab 7
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School
The University of Tennessee, Knoxville *
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Course
222
Subject
Geography
Date
Dec 6, 2023
Type
docx
Pages
2
Uploaded by UltraVultureMaster353
Laboratory Report 7
Goals: The goal of this lab is to test and understand how pressure acts on objects.
Experiment:
W
c
W
o
W
ow
W
cw
W
w
F
b
(F
b
-
W
w
)/F
b
Object
1
0.42N
2.64N
2.32N
0.72N
0.2N
0.32N
6.25%
Object
2
0.42N
3.42N
3.07N
0.71N
0.29N
0.35N
17.14%
Object
3
0.42N
2.40N
2.09N
0.69N
0.27N
0.31N
12.9%
Object
4
0.42N
0.88N
0.57N
0.71N
0.29N
0.31N
6.45%
m
o
m
w
V
w
ρ
o
material
Object 1
0.2694
0.0306
3.06X10^
-5
8.8X10^3
Brass
Object 2
0.3490
0.0296
2.96x10^-
5
11.8x10^
3
Lead
Object 3
0.2449
0.0276
2.76x10^-
5
8.9x10^3
Brass
Object 4
0.0898
0.0296
2.96x10^-
5
3x10^3
Aluminum
According to Archimedes’ principle, the buoyant force is equal to the weight of the
displacement fluid. Do your experiment results verify Archimedes’ principle? Comment on your
results. Do your experimentally determined densities of the various materials agree with the
densities given in your table? Comment on your results.
-
Yes the results verify Archimedes’ principle, the results were similar to each other with
the weights and densities of the objects.
Exploration:
As the pressure sensor is moved deeper into the liquid, how does the pressure change?
-
The pressure changes by increasing as the sensor moves into the liquid.
As liquid is added or removed from the basin, how does the pressure near the bottom of the
tank change?
-
When liquid is removed, the pressure near the bottom of the tank decreases, when
liquid is added, the pressure near the bottom of the tank decreases.
How does the pressure in the water change when the atmosphere is removed?
-
The pressure reduces dramatically when the atmosphere is removed.
Keeping all other conditions, the same, does the pressure a given distance below the surface
depend on the shape of the basin.
-
Yes, the pressure the pressure a given distance below the surface depends on the shape
of the basin.
How is the density of the fluid related to the pressure it exerts?
-
The density of the fluid is related to the pressure because the more dense the fluid is
the higher pressure the fluid will exert.
How does increasing gravity change the pressure in the fluid?
-
When you increase gravity the pressure of the fluid increases.
When g=9.8 m/s^2, how does pressure (in Pa) change for each meter of water depth?
-
When the g= 9.8 m/s^2 the pressure increases by 10 Pa per 1m for every meter of water.
Exercise:
Record your observations and explanations in your log.
1.
When I raised my hand above my head the vein on my wrist began sinking into my arm.
It stayed the same until wrist got to right about my head and I noticed the vein getting
smaller and smaller.
2.
When I began to lower my wrist the vein in my wrist bulged more. I believe this happens
because the pressure in my body decreases when I left my wrist. This is also because of
gravity, when I left my wrist above my head the blood in my vein goes back down
towards my heart.
3.
The paper did not blow off the books when I tried. I believe this is because of the
pressure that is exerted on the paper.
4.
The two pieces of paper blew apart from of each other when I blew on them. This is
because the of the thin surface between them.
5.
When I blew on the second straw water began to come out of the first straw. This is
because the pressure of the glass, due to the water being blown through, therefore
water can up the first straw.
Reflection:
In this experiment we test pressure and have different attributes affect the pressure in an
object.
The first experiment of this lab we testes Archimedes’ principle. We tested this by
determining the weight loss of weight in submerged objects and finding out the weight of the
displaced fluid. For each image we determined the weight when suspended and the weight
after the object has been lowered into the water. After finding these, we calculated the weight
of the water that was displaced as well as the buoyant force. We were then able to determine
the mass and density of the object, after those finding we were able to determine the material
of the object. We then participated in an exercise testing pressure in real life experiences. We
were using our own body, our vein, and paper and straws determining what the movement
meant about the pressure. Overall these explorations and experiments were to deepen our
understanding of pressure and buoyancy.
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